Convert flat roundish meshes to angular meshes
this is one possible way to make roundish curves  into angular meshes:

this is a curve object (closed):



in edit mode you can select all nodes and convert them as vector



which will "straighten" curves changing nodes handles



which will become



if you can get those shapes as svg, you could try steps above...

edit:

note, you can get perfectly square shapes if source svg curves have suitable control points, like in this example below: